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I'll keep this short and sweet.
I paid 50$ for Dragon Age 2 and loved every minute of it. Then it was over, and I played through with a new class, and enjoyed it just as much. SWTOR is offering MUCH more content than a game like DA:2.
You could treat SWTOR as a single player game... and get your moneys worth. I plan on buying it and playing to max level. Once max level I doubt I will continue, but it will be well worth the box cost for that much content.
Heaven and Hell is debatable - Karma is not.